4491840 has 56 divisors (see below), whose sum is σ = 14264640. Its totient is φ = 1197568.

The previous prime is 4491833. The next prime is 4491841. The reversal of 4491840 is 481944.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 4491798 and 4491807.

It is not an unprimeable number, because it can be changed into a prime (4491841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1380 + ... + 3299.

Almost surely, 2^4491840 is an apocalyptic number.

4491840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4491840 is an abundant number, since it is smaller than the sum of its proper divisors (9772800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4491840 is a wasteful number, since it uses less digits than its factorization.

4491840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4699 (or 4689 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 4491840 is about 2119.3961404136. The cubic root of 4491840 is about 164.9965104863.

The spelling of 4491840 in words is "four million, four hundred ninety-one thousand, eight hundred forty".